Asserts that the redirection options passed in match those of the redirect
called in the latest action. This match can be partial, such that
assert_redirected_to(controller: "weblog") will also
match the redirection of redirect_to(controller: "weblog",
action: "show") and so on.

# Asserts that the redirection was to the "index" action on the WeblogController
assert_redirected_to controller: "weblog", action: "index"
# Asserts that the redirection was to the named route login_url
assert_redirected_to login_url
# Asserts that the redirection was to the url for @customer
assert_redirected_to @customer
# Asserts that the redirection matches the regular expression
assert_redirected_to %r(\Ahttp://example.org)